Product Description
The ATS 309-815-4290 Stage 1 Allison LCT1000 Transmission Package is the perfect upgrade for 2004.5–2005 6.6L LLY Duramax trucks equipped with 4WD and PTO capability. Designed as a performance-enhanced replacement over stock, this transmission improves durability, shift quality, and torque handling while maintaining excellent drivability for daily use and towing applications.
This Stage 1 package is ideal for mildly modified trucks or heavy-duty work vehicles that demand increased reliability without stepping into extreme performance builds. With upgraded clutch materials, recalibrated valve body tuning, and improved internal components, this transmission addresses common factory weaknesses while extending service life.
Built to handle increased torque loads over stock, this transmission package ensures smoother shifts, better power transfer, and long-term dependability whether you're towing, hauling, or daily driving your Duramax.
FAQ
Q: What is the advantage of a Stage 1 transmission?
A: A Stage 1 transmission offers improved durability, better clutch materials, and enhanced shift quality over stock without being designed for extreme horsepower applications.
Q: Is this transmission suitable for towing?
A: Yes, this package is ideal for towing and work trucks, providing increased reliability and improved heat management compared to factory units.
Q: Does this transmission support PTO operation?
A: Yes, this unit is specifically configured for vehicles equipped with a Power Take-Off (PTO).
Q: What power levels can this handle?
A: This transmission is designed for stock to moderately upgraded trucks, typically supporting mild performance increases safely.
Fitment
- 2004.5 Chevrolet Silverado 2500HD/3500HD 6.6L LLY Duramax (4WD w/ PTO)
- 2005 Chevrolet Silverado 2500HD/3500HD 6.6L LLY Duramax (4WD w/ PTO)
- 2004.5 GMC Sierra 2500HD/3500HD 6.6L LLY Duramax (4WD w/ PTO)
- 2005 GMC Sierra 2500HD/3500HD 6.6L LLY Duramax (4WD w/ PTO)
Key Features
- Stage 1 performance-built Allison LCT1000 transmission
- Designed for stock to mildly modified trucks
- Upgraded clutch materials for improved durability
- Enhanced valve body tuning for smoother, firmer shifts
- PTO compatible configuration
- Improved reliability over factory transmission
- Ideal for towing, hauling, and daily driving
- 4WD specific build
Specifications for ATS 309-815-4290
| Specification | Details |
|---|---|
| Part Number | 309-815-4290 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 1 |
| Drivetrain | 4WD |
| PTO Compatibility | Yes |
| Engine Compatibility | 6.6L Duramax LLY |
| Model Years | 2004.5 - 2005 |
| Performance Level | Stage 1 (Stock to Mild Builds) |
| Shipping Weight | Approximately 400 lbs |
| Shipping Method | Freight (Core Charge Applies) |
| Warranty | 5 Year / 500,000 Mile Limited Warranty |
| California Prop 65 | WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
